Cooking of dry high-lignin Eucalyptus camaldulensis chips followed by TCF bleaching with hydrogen peroxide

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Fiskari, Juha Vihelä, Tuomas Ruuttunen, Kyösti Ali-Rekola, Ville Hautala, Sanna Sixta, Herbert 2019-04-02T06:54:43Z 2019-04-02T06:54:43Z 2017-09-01
dc.identifier.citation Fiskari , J , Vihelä , T , Ruuttunen , K , Ali-Rekola , V , Hautala , S & Sixta , H 2017 , ' Cooking of dry high-lignin Eucalyptus camaldulensis chips followed by TCF bleaching with hydrogen peroxide ' Cellulose Chemistry and Technology , vol. 51 , no. 9-10 , pp. 857-861 . en
dc.identifier.issn 0576-9787
dc.identifier.other PURE UUID: 69bb3adb-6e8c-4965-a821-f1fc882147b8
dc.identifier.other PURE ITEMURL:
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dc.description.abstract This paper describes laboratory experiments with Eucalyptus camaldulensis grown in South Asia. Pulping of E. camaldulensis is known to be challenging because of its high lignin content. Moreover, E. camaldulensis chips originating from arid and semi-arid regions of South Asia have often a very low moisture content, which further complicates their pulping. In this research, chips with 5.5% moisture content were screened and the accept fraction underwent a pressurized soaking treatment, which seemingly dissolved carbohydrates, extractives and lignin. The rewetted chips were cooked to a kappa number of 18, oxygen delignified and bleached with hydrogen peroxide. The yield was 45.4% based on unbleached pulp. Pulp viscosities after cooking, oxygen delignification and bleaching were 830, 700, and 600 mL/g, respectively. The high active alkali charge in cooking apparently resulted in low pulp viscosities. In addition to lignin, E. camaldulensis probably contained other polyphenolic compounds, which further consumed alkali. The bleached pulp brightness was 85.5% ISO. en
dc.format.extent 5
dc.format.extent 857-861
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Editura Academiei Romane
dc.relation.ispartofseries Cellulose Chemistry and Technology en
dc.relation.ispartofseries Volume 51, issue 9-10 en
dc.rights openAccess en
dc.subject.other Organic Chemistry en
dc.subject.other Materials Chemistry en
dc.subject.other 220 Industrial biotechnology en
dc.title Cooking of dry high-lignin Eucalyptus camaldulensis chips followed by TCF bleaching with hydrogen peroxide en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department University of Helsinki
dc.contributor.department Department of Bioproducts and Biosystems
dc.contributor.department Finnish Forest Research Institute
dc.subject.keyword Conventional batch cooking
dc.subject.keyword Dry chips
dc.subject.keyword Eucalyptus camaldulensis
dc.subject.keyword Hydrogen peroxide bleaching
dc.subject.keyword Lignin content
dc.subject.keyword Organic Chemistry
dc.subject.keyword Materials Chemistry
dc.subject.keyword 220 Industrial biotechnology
dc.identifier.urn URN:NBN:fi:aalto-201904022454
dc.type.version publishedVersion

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